| API | Application Programming Interfaces --> see the section "What is API"? |
| API call | A process of sending a request to an API endpoint and getting a response |
| API endpoint / operation | A single instance of API with a unique address (URL). Sending a required input to that URL triggers some command within your system and returns an output about a successful result or failure |
| CLI | Command-line interface |
| Client | A general term to identify someone or something calling your API |
| HTTP | HyperText Transfer Protocol |
| IDL | Interface Definition Language |
| MSA | Microservice Architecture |
| OAI | OpenAPI Initiative |
| REST | REpresentational State Transfer |
| RPC | Remote Procedural Call |
| SaaS | Software-as-a-Service |
| SOAP | Simple Object Access Protocol |